I'm taking apart some rear leafs on a 70 FJ40 this weekend to install some angled shims can someone tell me the center bolt size so I can have some ready to install? TIA
Leaf spring center bolt size?
- Thread starter 1 sicbronconut
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I had the same problem on my fronts. I added shims to make up for longer shackles and the bolt heads don't go into the axle mount so the axle can slide. I ended up using a set of grade 8 bolts upside down with double nuts on the top. It made it long enough to capture the axle, but I don't like it.
Do they make the bolts with taller heads for this purpose? I am getting ready for a spring flip in front so now's the time to do it right.
Do they make the bolts with taller heads for this purpose? I am getting ready for a spring flip in front so now's the time to do it right.
The actual size for the Center Pins on the leaf spring stack is 3/8".
Yes, I just got a set to replace a broken one. They are long to to go through the shim into the perch.
The ones I just got from SOR are 5/16x5"
yzftaco
Goofy-Goober
Not sure what you use your rig for, but....
While you have it all apart.. drill all the center holes in each leaf bigger and run a larger diameter bolt thru them.. A lot of people say a masonary bit works well.. I used a carbide ball end-mill to make the holes 7/16..
my 2 cents
While you have it all apart.. drill all the center holes in each leaf bigger and run a larger diameter bolt thru them.. A lot of people say a masonary bit works well.. I used a carbide ball end-mill to make the holes 7/16..
my 2 cents
Cruiserdrew
On the way there
The center pin size varies by year. Early 40s are quite small, FJ60s are significantly bigger. I've made it a habit to drill them out to 7/16 and use either a grade 12 cap screw, or a Rockford spring pin that size from Napa. The head is then 5/8 inch and you may need to slightly drill out the hole in the perch.
Not a bad idea. I already bent a grade 5 5/16" bolt in a front spring pack. I upgraded to grade 8, but larger makes sense. I am going to redrill for a spring flip anyway. Might as well go larger.
Josie'sLandCruiser
Stop calling it a "FJ."
Hi All:
I have used a Uni-Bit to both enlarge existing pin holes and drill new ones in spring leafs. The trick is to use a slow-speed drill (like, ~ 250 RPM) and lots of cutting oil.
Regards,
Alan
I have used a Uni-Bit to both enlarge existing pin holes and drill new ones in spring leafs. The trick is to use a slow-speed drill (like, ~ 250 RPM) and lots of cutting oil.
Regards,
Alan
- Thread starter
- #12
They ended up big just a little smaller than the 3/8" ones I bought, just had to drill the holes out a little bit. I'm working on a spring over that was not done very well. I've added a 4 degree shim and installed a rear drive line with CV style upper joint and still have some vibration right at 45 mph. The FJ40 also has a GM 5.3L/700R swap so the rear drive line is super short. My local guy had a problem sourcing parts to build a rear drive line with the CV style joint and I'm wondering if it's still part of the problem, anybody know a good drive line builder for Toyota drive shafts??
